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Income Taxes - Federal Income Tax Reform (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 10, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]          
Net increase (decrease) in regulatory liabilities       $ 7,175  
Net decrease in deferred income tax liabilities (deferred income tax assets)       1,910  
Net increase in affiliate receivables (affiliate payables)       0  
Net deferred income tax expense       5,265  
Income taxes (benefit)   $ 20,636 $ (25,282) 7,775  
Public Service Company of New Mexico          
Income Taxes [Line Items]          
Net increase (decrease) in regulatory liabilities       11,244  
Net decrease in deferred income tax liabilities (deferred income tax assets)       (2,175)  
Net increase in affiliate receivables (affiliate payables)       12,300  
Net deferred income tax expense       1,119  
Income taxes (benefit)   21,857 (25,962) (5,971)  
TNMP          
Income Taxes [Line Items]          
Net increase (decrease) in regulatory liabilities       (4,069)  
Net decrease in deferred income tax liabilities (deferred income tax assets)       (9,784)  
Net increase in affiliate receivables (affiliate payables)       4,042  
Net deferred income tax expense       1,673  
Income taxes (benefit)   6,308 5,046 16,880  
Corporate and Other          
Income Taxes [Line Items]          
Net increase (decrease) in regulatory liabilities       0  
Net decrease in deferred income tax liabilities (deferred income tax assets)       13,869  
Net increase in affiliate receivables (affiliate payables)       (16,342)  
Net deferred income tax expense       2,473  
Income taxes (benefit)   (7,529) (4,366) $ (3,134)  
NMPRC          
Income Taxes [Line Items]          
Proposed term for providing benefits to customers related to reduction in state corporate tax         23 years
NMPRC | Public Service Company of New Mexico          
Income Taxes [Line Items]          
Proposed term for providing benefits to customers related to reduction in state corporate tax 3 years        
New Mexico 2015 Rate Case | Public Service Company of New Mexico          
Income Taxes [Line Items]          
Pre-tax impairment of investments   150,600 150,600    
Income taxes (benefit)   $ 45,700 $ (45,700)